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  • Question

  • In class C operation of an amplifier circuit, the collector current exists for


  • Options
  • A. 360° of input wave
  • B. 180° of input wave
  • C. more than 180° of input wave
  • D. less than 180° of input wave

  • Correct Answer
  • less than 180° of input wave 

    Explanation
    In class C operation output is in the form of short duration pulses.

    More questions

    • 1. In a microwave coaxial line, the maximum operating frequency is f max and breakdown strength of dielectric is Ed' Then maximum power handling capacity is proportional to

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 2. If m, v, r are the mass, velocity and radius of orbit of electron and h is Planck's constant, quantum condition for electron's orbit is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 3. Which chopper circuit operates in all the 4 quadrants?

    • Options
    • A. A
    • B. C
    • C. D
    • D. E
      • Discuss
    • 4. If r is resistivity, l is length of wire, a is area of cross-section, ? is angular frequency, F is form factor, n is number of turns, d is coil diameter and r is resistance of a coil.

      List I List II
      A. Value of inductance 1.
      B. Power factor 2.
      C. Q factor 3.
      D. Value of resistance 4. Fn2d


    • Options
    • A. A-1, B-2, C-3, D-4
    • B. A-4, B-3, C-2, D-1
    • C. A-4, B-2, C-3, D-1
    • D. A-1, B-3, C-2, D-4
      • Discuss
    • 5. In a 100 turn coil, if the flux through each turn is (t3 - 2t)mWb, the magnitude of the induced emf in the coil at a time of 4 sec is

    • Options
    • A. 46 mV
    • B. 56 mV
    • C. 4.6 V
    • D. 5.6 V
      • Discuss
    • 6. The torque (in mm) acting on a circular current loop of radius 1 mm in the xy plane, connected at the origin and with current 0.1 A, flowing in the sense of increasing in a magnetic field
      is

    • Options
    • A.
    • B.
    • C. 10-12p
    • D. - 10-12p
      • Discuss
    • 7. Microwave resonators are used in

    • Options
    • A. microwave oscillators
    • B. microwave narrow band amplifier
    • C. microwave frequency metres
    • D. all of the above
      • Discuss
    • 8. Consider the following statements

      1. Impedance of Gunn diode is about tens of ohms.
      2. Impedance of Impatt diode is a few ohms.
      3. Impedance of Impatt diode are of the same order.
      4. Impedance of Impatt diode is more than that of Gunn diode.
      Which of the above statement are correct?

    • Options
    • A. all
    • B. 1 and 2 only
    • C. 1, 2 and 3
    • D. 1, 2 and 4
      • Discuss
    • 9. Consider the following statements

      1. Bunching of electrons occurs in two cavity klystron amplifier.
      2. Bunching of electrons occurs in multi cavity klystron amplifier.
      3. Bunching of electrons occurs in reflex cavity klystron amplifier.
      Which of the above statements are correct?

    • Options
    • A. 1, 2, and only
    • B. 1, 2 and 3 only
    • C. 1 and 3 only
    • D. 2 and 3 only
      • Discuss
    • 10. A single phase cycloconverter with centre tapped input transformer requires

    • Options
    • A. 2 thyristors
    • B. 4 thyristors
    • C. 8 thyristors
    • D. either 2 or 4 thyristors
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